Improvement in machinery for cleansing paper-pulp



VUNITED STATES PATENT OFFICE.

SAMUEL S. CROCKER, OF LAWRENCE, MASSACHUSETTS.

\ IMPROVEMENT IN MACHINERY FOR CLEANSING PAPER-PULP.

Y Specication forming part of Letters Patent No. 34,945, dated April 15, 1862;

.To all whom it may concern:

Be it known that I, SAMUEL S. CROCKER, of the city of Lawrence, in the county of Essex and State of Massachusetts, have invented a Paper-Pulp Cleanser; and l do hereby declare that the following, taken in connection with the drawings which accompany and form part ot' this specification, is a description of my invention sufficient 4to enable Those skilled in the art to practice it.

My invention consists in an apparatus operating substantially like that herein described for the purpose of cleansing paperpulp from such foreign matter as is of greater speciiic gravity than the said pulp, the object being to avoid passing into the paper machinery such substances as bits of needles, sand,&c., which injure said machinery, particularly the calender-rolls.

Figure l exhibits in vertical sectional elevation an apparatus embodying my invention, and Fig. 2 a horizontal section and plan of the same.

a represents a receptacle or tank, the body of which is best made cylindrical. The bottom must be made concave or inclined and provided at its lowest point with an outletvalve z'. In this tank any convenient stirring or agit-ating device may be operated. That shown consists of a bar IJ, provided at its ends with iioats or paddles c. The bar is fixed to shaft d, which is hung and caused to rotate in bearings in the supports c e.

The tank is provided with three apertures, located nearly as shown, f being for the admission of pulp, g for admission of water for mixing with the pulp, and 7L for drawing oit the mixture. All of these apertures are to be provided with suitable valves to regulate the iiow through them. A small receptacle j is closely secured to the large one, and surrounds the lower side of valve i. This valve is operated from beneath by a stem which passes through a stuffing-box in the lower part of j, said valve and stem being raised and lowered by operating the lever 7c. The

receptacle j is provided with a pipe m, byand through which water is thereunto supplied, and with an aperture n, through which j may be emptied of its contents. Both m and n nected with f and g being then closed, the

stirrer is set in motion, by which the contents of a are thoroughly mixed and the lumps broken up, making the mixture uniform throughout. It will be evident that heavy particles, like sand, bits of needles, dto., will sink through the iiuid or semi-Huid contents of a till they touch upon `the inclined bottom of the large receptacle, where,

being disturbed by the motion of the pulp, they will gravitate toward the lowest point of the bottom and will settle around valve t'. It is evident that if now the valve t' is opened the said heavy particles will fall into the small receptacle beneath, together with pulp enough to fill said receptacle; but it is desirable to separate the heavy particles from the pulp, vwhile retaining the pulp within the large receptacle. This I do by opening the Valve connected with m and filling] with water, subsequent to which, and after closing the valve connected with m, I raise the valve i by means of lever 7c. The heavy particles settled around fi being disturbed by the movement ot' the contents of a, fall through the opening under valve z' into j, while but little if any of the pulp in a changes place with the water in j. The valve t' being then closed, the receptacle j can be emptied of its contents by opening the aperture n, and a stream of water introduced fromm will aid in cleansing The pulp in c, may now be drawn olf for use through 7L, the aperture closed, the

tank a again filled, and the operations del scribed repeated at will. iVhen the'stirrer used is a rotary one and rotation is given to the contents of a., the surface of said contents will become concave by virtue of centrifugal force, and any light particles of foreign matter will iioat down the incline of the sunface lf the pulp needs to beA In Witness whereof I have hereunto set my hand this 20th day ofpFebruary, A. D. 1862.

SAMUEL S. CROOKER.

In presence of-l N. W. HARMON, WILLIAM D. JOPLIN. 

